Skip to main content

Table 4 Cox regression analysis. Risk of revision due to deep infection for the low-risk patienta in four different procedure duration groups

From: Patient and surgical factors affecting procedure duration and revision risk due to deep infection in primary total knee arthroplasty

  Cox regressiond
Unadjusted Adjusted
Procedure duration No of TKA No of revisionsb K-M 1y %c K-M 4y %c HR (95% CI) p-value HR (95% CI) p-value
<75 3232 31 0.68 1.00 1   1  
75-89 3718 30 0.57 0.84 0.8 (0.5 - 1.4) 0.5 0.8 (0.5 - 1.3) 0.4
90-109 5130 44 0.49 0.78 0.9 (0.6 – 1.4) 0.6 0.8 (0.5 – 1.3) 0.4
≥110 4177 52 0.72 1.10 1.2 (0.8 – 1.9) 0.3 1.1 (0.7 – 1.7) 0.6
  1. aThe low-risk TKA patient: TKA patient with primary osteoarthritis, ASA 1 or 2, without any previous surgery to the knee and no registered perioperative complications (n = 16,257)
  2. bNumber of revisions due to deep infection (n = 157)
  3. cKaplan-Meier estimated proportion of revisions due to deep infection at 1 and 4 years follow-up
  4. dUnadjusted and adjusted Hazard ratios (HR) estimated with the Cox proportional hazards model, adjusted for sex and age